We are currently discussingq with my colleagues what the correct grammar would be in this context: you have just finished a meal and want to say it was/has been the best meal you ever had. What tenses ...

First a little history before I pose my question. Without this history my question may not fully make sense.
King Fahd of Saudi Arabia had a stroke in 1995. After this stroke, Crown Prince Abdullah ...

I have a question concerning Past and Present Perfect tenses/the sequence of events.
"As my school project, I have written a 44-pages-long research paper in which I had analysed the risk behaviours ...

Could you please tell me which one is correct (or which one is the correct one?) out of each set of sentences?
None of them are from a quiz or a practice. These are sentences that I've tried to made ...